package com.competitions.videoedithelper.utils;

import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * @author Mapler
 */
public class IpUtil {
    private static final Logger logger = LoggerFactory.getLogger(IpUtil.class);

    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress;
        String unknown = "unknown";
        String localHost = "127.0.0.1";
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || unknown.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || unknown.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || unknown.equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (localHost.equals(ipAddress)) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        logger.error("获取用户的主机发生异常",e);
                    }
                    if(inet!=null){
                        ipAddress = inet.getHostAddress();
                    }
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) {
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress="";
            logger.error("获取用户的ip地址发生异常",e);
        }
        return ipAddress;
    }
}
